This is the start a series of posts about the notes I made when I read the source code of popular open source projects. I myself learned a lot from digging into the code of open source projects. I hope it can help you too.

I will start with Loki, a log aggregation system inspired by Prometheus.

Overview

grafana/loki consists two components:

• Loki: the log aggregation system
• Promtail: the agent to collect logs and send to Loki

in a nutshell, loki and promtail is a service-client arhitecture. Both of them are written in Go. As we are reading the code for learning purpose, it’s better to read with questions in mind. Here are some of mine I would like to discuss in a couple of posts: